Glamour girls Lady Gaga, Sharon Osbourne, and Cyndi Lauper helped launch the latest MÂ·AÂ·C Viva Glam campaign at Il Bottaccio in London on Monday (March 1), where Gaga is currently on tour.

The pop star tweeted that the long-awaited video for “Telephone” featuring Beyoncé is still being perfected. “‘Telephone’ is coming I promise! Still editing. I want it to be perfect. The Haus has dubbed her a ‘masterpiece.'”